In Greek mythology, Cyclopes are giants with one round eye, placed in the middle of their foreheads. They are the sons of Uranus and Gaia and belong to the race of Titans.
They were thrown in the Tartarus by Uranus, but were later released by Zeus and helped him with his battle against the Titans. They are Brontes, Steropes and Arges.
In Homer's Odyssey, the Cyclopes are ferocious, man-eating giants. Odysseus was able to puncture the eye of one of them, Polyphemos (a son of Poseidon), when they were taken prisoner. Thus they could escape. In later myths, the Cyclopes are the helpers of Hephaestus, the god of fire, and they forged lightning for Zeus. They were also thought to have build the great walls of ancient citadels, such as Mycene and Tiryns.